/**
 
@Name : layui.laytpl 模板引擎
@Author：贤心
@License：MIT
 
*/

layui.define(function (exports) {

    "use strict";

    var config = {
        open: '{{',
        close: '}}'
    };

    var tool = {
        exp: function (str) {
            return new RegExp(str, 'g');
        },
        //匹配满足规则内容
        query: function (type, _, __) {
            var types = [
                '#([\\s\\S])+?',   //js语句
                '([^{#}])*?' //普通字段
            ][type || 0];
            return exp((_ || '') + config.open + types + config.close + (__ || ''));
        },
        escape: function (html) {
            return String(html || '').replace(/&(?!#?[a-zA-Z0-9]+;)/g, '&amp;')
                .replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/'/g, '&#39;').replace(/"/g, '&quot;');
        },
        error: function (e, tplog) {
            var error = 'Laytpl Error：';
            typeof console === 'object' && console.error(error + e + '\n' + (tplog || ''));
            return error + e;
        }
    };

    var exp = tool.exp, Tpl = function (tpl) {
        this.tpl = tpl;
    };

    Tpl.pt = Tpl.prototype;

    window.errors = 0;

    //编译模版
    Tpl.pt.parse = function (tpl, data) {
        var that = this, tplog = tpl;
        var jss = exp('^' + config.open + '#', ''), jsse = exp(config.close + '$', '');

        tpl = tpl.replace(/\s+|\r|\t|\n/g, ' ')
            .replace(exp(config.open + '#'), config.open + '# ')
            .replace(exp(config.close + '}'), '} ' + config.close).replace(/\\/g, '\\\\')

            //不匹配指定区域的内容
            .replace(exp(config.open + '!(.+?)!' + config.close), function (str) {
                str = str.replace(exp('^' + config.open + '!'), '')
                    .replace(exp('!' + config.close), '')
                    .replace(exp(config.open + '|' + config.close), function (tag) {
                        return tag.replace(/(.)/g, '\\$1')
                    });
                return str
            })

            //匹配JS规则内容
            .replace(/(?="|')/g, '\\').replace(tool.query(), function (str) {
                str = str.replace(jss, '').replace(jsse, '');
                return '";' + str.replace(/\\/g, '') + ';view+="';
            })

            //匹配普通字段
            .replace(tool.query(1), function (str) {
                var start = '"+(';
                if (str.replace(/\s/g, '') === config.open + config.close) {
                    return '';
                }
                str = str.replace(exp(config.open + '|' + config.close), '');
                if (/^=/.test(str)) {
                    str = str.replace(/^=/, '');
                    start = '"+_escape_(';
                }
                return start + str.replace(/\\/g, '') + ')+"';
            });

        tpl = '"use strict";var view = "' + tpl + '";return view;';

        try {
            that.cache = tpl = new Function('d, _escape_', tpl);
            return tpl(data, tool.escape);
        } catch (e) {
            delete that.cache;
            return tool.error(e, tplog);
        }
    };

    Tpl.pt.render = function (data, callback) {
        var that = this, tpl;
        if (!data) return tool.error('no data');
        tpl = that.cache ? that.cache(data, tool.escape) : that.parse(that.tpl, data);
        if (!callback) return tpl;
        callback(tpl);
    };

    var laytpl = function (tpl) {
        if (typeof tpl !== 'string') return tool.error('Template not found');
        return new Tpl(tpl);
    };

    laytpl.config = function (options) {
        options = options || {};
        for (var i in options) {
            config[i] = options[i];
        }
    };

    laytpl.v = '1.2.0';

    exports('laytpl', laytpl);

});